Form 4 Filing for Assembly Biosciences, Inc.

Jeanette M. Bjorkquist, PFO and PAO of Assembly Biosciences, Inc., reported a series of transactions involving the company's common stock. On March 29, 2026, Bjorkquist acquired 6,500 shares through the grant of restricted stock units (RSUs), which vest in four equal installments through March 29, 2030. These RSUs represent 65% of her annual equity grant, with the remainder contingent upon stockholder approval of an amendment to the company's stock incentive plan. Subsequently, on March 30, 2026, Bjorkquist sold a total of 328 shares (312 + 16) to cover tax withholding obligations. These sales were mandated by a "sell-to-cover" policy and occurred at weighted average prices of $26.6502 and $27.49, respectively. The post-transaction share count reflects a reduction of 300 shares due to a prior administrative error.